MCP9804T-ESLASHMS datasheet(22/52 Pages) MICROCHIP

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MCP9804

DS20002203D-page 22

 2009-2018 Microchip Technology Inc.

5.1.2

UPPER/LOWER/CRITICAL

TEMPERATURE LIMIT REGISTERS

(TUPPER/TLOWER/TCRIT)

The MCP9804 has a 16-bit read/write Alert Output

Temperature Upper Boundary register (TUPPER), a 16-bit

Lower Boundary register (TLOWER) and a 16-bit Critical

Boundary register (TCRIT) that contain 11-bit data in

two’s complement format (0.25°C). This data represents

the maximum and minimum temperature boundary or

temperature window that can be used to monitor

ambient temperature. If this feature is enabled

(Section 5.1.1

“Sensor

Configuration

(CONFIG)”) and the ambient temperature exceeds the

specified boundary or window, the MCP9804 asserts an

Alert output. (Refer to Section 5.2.3 “Alert Output

Configuration”).

TUPPER/TLOWER/TCRIT: UPPER/LOWER/CRITICAL TEMPERATURE LIMIT

(

 ADDRESS ‘0000 0010’b/‘0000 0011’b/‘0000 0100’b)(1)

U-0

R/W-0

—

—Sign

27°C

26°C

25°C

24°C

bit 15

bit 8

R/W-0

U-0

23°C

22°C

21°C

20°C

2-1°C

2-2°C

—

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 15-13

Unimplemented: Read as ‘0’

bit 12

Sign: Sign bit

= TA 0°C

= TA  0°C

bit 11-2

TUPPER/TLOWER/TCRIT: Temperature Boundary bits

Temperature boundary trip data in two’s complement format.

bit 1-0

Unimplemented: Read as ‘0’

Note 1:

This table shows two 16-bit registers for TUPPER, TLOWER and TCRIT, located at ‘0000 0010b’,

‘0000 0011b’ and ‘0000 0100b’, respectively.

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